The major histocompatibility complex class II Ea promoter requires TFIID binding to an initiator sequence

Marianna Bellorini, Jean Christophe Dantonel, Jong Bok Yoon, Robert G. Roeder, Laszlo Tora, Roderto Mantovani

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30 Citations (Scopus)

Abstract

The major histocompatibility complex (MHC) class II Ea promoter is dependent on the presence of conserved upstream X and Y boxes and of initiator (Inr) sequences. In vitro transcription analysis of the Inr region with linker-scanning mutants pinpoints a functionally essential element that shows homology to the terminal deoxynucleotidyltransferase (TdT) Inr; contrary to the TdT Inr and other Inrs identified so far, the key sequence, between positions +5 and +12, is located within a transcribed area. Swapping the TdT sequence into the corresponding Ea position leads to a fivefold increase in transcription rate, without altering start site selection. Inr- binding proteins LBP-1/CP2 and TIP-a TdT Inr-binding protein unrelated to YY1-recognize the Ea Inr; they interact with overlapping yet distinct sequences around the Cap site, but their binding does not coincide with Ea Inr activity. A good correlation is, rather, found with binding of immunopurified holo-TFIID to this element. TFIID interacts both with Ea TATA- like and Inr sequences, but only the latter is functionally relevant. Unlike TBP, TFIID binds in the absence of TFIIA, indicating a stabilizing role for TBP-associated factors in Ea promoter recognition. Sequence comparison with other mouse and human MHC class II promoters suggests a common mechanism of start site(s) selection for the MHC class II gene family.

Original languageEnglish
Pages (from-to)503-512
Number of pages10
JournalMolecular and cellular biology
Volume16
Issue number2
DOIs
Publication statusPublished - 1996 Feb

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Cell Biology

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